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Author: Paul Van Nguyen
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
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Book Description
With the advent of two-dimensional (2D) materials came a library of new systems that not only individually host novel states of matter but are naturally suited to being stacked into heterostructures – a virtually limitless space of possible geometries for study. The incorporation of electrical contacts transforms these heterostructures into 2D electrical devices wherein electronic behavior can be simultaneously probed and tuned by locally applied electric fields. This thesis presents pioneering studies of the electronic band structure in such devices in-operando using sub-micrometer angle-resolved photoemission spectroscopy (micro-ARPES), a surface-sensitive technique already perfectly suited to probe the electronic states in these 2D systems made more powerful by the addition of in-situ control of carrier densities and local electric fields.Following a brief background review of 2D materials and ARPES, I will show how with careful sample design and preparation micro-ARPES was applied for the first time to artificially stacked structures of prototypical 2D materials, graphene and atomically thin semiconducting transition metal dichalcogenides (TMD). From there, I will demonstrate how in-situ control of an electrostatic back gate voltage alleviates a fundamental limitation of ARPES as a probe of only occupied states and study the electronic landscape in two-terminal TMD field-effect transistor devices as a function of applied electric field and doping. I will then take a detour to discuss the possible effects of relative crystallographic alignments in heterostructures on the micro-ARPES spectra, which ultimately stem from a combination of moiré effects and electron diffraction. I will then turn to gated devices with monolayer WTe2 and study the bands as a function of doping and temperature to shed light on the of its unusual insulating state below 100K which interplays with topologically insulating and superconducting behavior recently shown in transport measurement. Finally, I will conclude with a brief discussion of the outlook for micro-ARPES of 2D materials in devices under operation.
Author: Paul Van Nguyen
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
Get Book Here
Book Description
With the advent of two-dimensional (2D) materials came a library of new systems that not only individually host novel states of matter but are naturally suited to being stacked into heterostructures – a virtually limitless space of possible geometries for study. The incorporation of electrical contacts transforms these heterostructures into 2D electrical devices wherein electronic behavior can be simultaneously probed and tuned by locally applied electric fields. This thesis presents pioneering studies of the electronic band structure in such devices in-operando using sub-micrometer angle-resolved photoemission spectroscopy (micro-ARPES), a surface-sensitive technique already perfectly suited to probe the electronic states in these 2D systems made more powerful by the addition of in-situ control of carrier densities and local electric fields.Following a brief background review of 2D materials and ARPES, I will show how with careful sample design and preparation micro-ARPES was applied for the first time to artificially stacked structures of prototypical 2D materials, graphene and atomically thin semiconducting transition metal dichalcogenides (TMD). From there, I will demonstrate how in-situ control of an electrostatic back gate voltage alleviates a fundamental limitation of ARPES as a probe of only occupied states and study the electronic landscape in two-terminal TMD field-effect transistor devices as a function of applied electric field and doping. I will then take a detour to discuss the possible effects of relative crystallographic alignments in heterostructures on the micro-ARPES spectra, which ultimately stem from a combination of moiré effects and electron diffraction. I will then turn to gated devices with monolayer WTe2 and study the bands as a function of doping and temperature to shed light on the of its unusual insulating state below 100K which interplays with topologically insulating and superconducting behavior recently shown in transport measurement. Finally, I will conclude with a brief discussion of the outlook for micro-ARPES of 2D materials in devices under operation.
Author: Zongyu Huang
Publisher: CRC Press
ISBN: 1000562840
Category : Science
Languages : en
Pages : 166
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Book Description
Monoelemental 2D materials called Xenes have a graphene-like structure, intra-layer covalent bond, and weak van der Waals forces between layers. Materials composed of different groups of elements have different structures and rich properties, making Xenes materials a potential candidate for the next generation of 2D materials. 2D Monoelemental Materials (Xenes) and Related Technologies: Beyond Graphene describes the structure, properties, and applications of Xenes by classification and section. The first section covers the structure and classification of single-element 2D materials, according to the different main groups of monoelemental materials of different components and includes the properties and applications with detailed description. The second section discusses the structure, properties, and applications of advanced 2D Xenes materials, which are composed of heterogeneous structures, produced by defects, and regulated by the field. Features include: Systematically detailed single element materials according to the main groups of the constituent elements Classification of the most effective and widely studied 2D Xenes materials Expounding upon changes in properties and improvements in applications by different regulation mechanisms Discussion of the significance of 2D single-element materials where structural characteristics are closely combined with different preparation methods and the relevant theoretical properties complement each other with practical applications Aimed at researchers and advanced students in materials science and engineering, this book offers a broad view of current knowledge in the emerging and promising field of 2D monoelemental materials.
Author: Phaedon Avouris
Publisher: Cambridge University Press
ISBN: 1316738132
Category : Technology & Engineering
Languages : en
Pages : 521
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Book Description
Learn about the most recent advances in 2D materials with this comprehensive and accessible text. Providing all the necessary materials science and physics background, leading experts discuss the fundamental properties of a wide range of 2D materials, and their potential applications in electronic, optoelectronic and photonic devices. Several important classes of materials are covered, from more established ones such as graphene, hexagonal boron nitride, and transition metal dichalcogenides, to new and emerging materials such as black phosphorus, silicene, and germanene. Readers will gain an in-depth understanding of the electronic structure and optical, thermal, mechanical, vibrational, spin and plasmonic properties of each material, as well as the different techniques that can be used for their synthesis. Presenting a unified perspective on 2D materials, this is an excellent resource for graduate students, researchers and practitioners working in nanotechnology, nanoelectronics, nanophotonics, condensed matter physics, and chemistry.
Author: Md Nurunnabi
Publisher: Elsevier
ISBN: 0128162694
Category : Technology & Engineering
Languages : en
Pages : 399
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Book Description
Biomedical Applications of Graphene and 2D Nanomaterials provides a much-needed reference on the biomedical applications of 2D nanomaterials, as well as theoretical knowledge on their structure, physicochemical properties and biomedical applications. Chapters are dedicated to growth areas, such as size and shape-dependent chemical and physical properties and applications, such as in diagnostic and therapeutic products. The book also discusses the concept, development and preclinical studies of 2D nanomaterials-based biomedical tools, such as biosensors, artificial organs and photomedicine. Case studies and reports form the core of the book, making it an ideal resource on potential applications in biomedical science and engineering. This timely resource for scientists and engineers in this rapidly advancing field features contributions from over 30 leaders who address advanced methods and strategies for controlling the physical-chemical properties of 2D nanomaterials, along with expert opinions on a range of 2D nanomaterials that have therapeutic and diagnostic applications. Presents advanced methods and strategies for controlling the physical-chemical properties of 2D nanomaterials Provides state-of-the-art biomedical applications for 2D nanomaterials, including graphene and boron nitride Includes key information from a broad selection of subject areas for researchers in both materials, engineering and medicine
Author: Alexander V. Kolobov
Publisher: Springer
ISBN: 3319314505
Category : Technology & Engineering
Languages : en
Pages : 545
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Book Description
This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.
Author: D. P. Woodruff
Publisher: Cambridge University Press
ISBN: 9780521424981
Category : Science
Languages : en
Pages : 612
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Book Description
Revised and expanded second edition of the standard work on new techniques for studying solid surfaces.
Author: George Gruner
Publisher: CRC Press
ISBN: 0429969562
Category : Science
Languages : en
Pages : 288
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Book Description
?Density Waves in Solids is written for graduate students and scientists interested in solid-state sciences. It discusses the theoretical and experimental state of affairs of two novel types of broken symmetry ground states of metals, charge, and spin density waves. These states arise as the consequence of electron-phonon and electron-electron interactions in low-dimensional metals.Some fundamental aspects of the one-dimensional electron gas, and of the materials with anisotropic properties, are discussed first. This is followed by the mean field theory of the phases transitions?discussed using second quantized formalism?together with the various experimental observations on the transition and on the ground states. Fluctuation effects and the collective excitations are reviewed next, using the Ginzburg-Landau formalism, followed by the review of the interaction of these states with the underlying lattice and with impurities. The final chapters are devoted to the response of the ground states to external perturbations.
Author: Claudia Cancellieri
Publisher: Springer
ISBN: 3319749897
Category : Technology & Engineering
Languages : en
Pages : 326
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Book Description
This book summarizes the most recent and compelling experimental results for complex oxide interfaces. The results of this book were obtained with the cutting-edge photoemission technique at highest energy resolution. Due to their fascinating properties for new-generation electronic devices and the challenge of investigating buried regions, the book chiefly focuses on complex oxide interfaces. The crucial feature of exploring buried interfaces is the use of soft X-ray angle-resolved photoemission spectroscopy (ARPES) operating on the energy range of a few hundred eV to increase the photoelectron mean free path, enabling the photons to penetrate through the top layers – in contrast to conventional ultraviolet (UV)-ARPES techniques. The results presented here, achieved by different research groups around the world, are summarized in a clearly structured way and discussed in comparison with other photoemission spectroscopy techniques and other oxide materials. They are complemented and supported by the most recent theoretical calculations as well as results of complementary experimental techniques including electron transport and inelastic resonant X-ray scattering.
Author: Carmen Palacios-Berraquero
Publisher: Springer
ISBN: 3030014827
Category : Computers
Languages : en
Pages : 125
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Book Description
This book presents the first established experimental results of an emergent field: 2-dimensional materials as platforms for quantum technologies, specifically through the optics of quantum-confined excitons. It also provides an extensive review of the literature from a number of disciplines that informed the research, and introduces the materials of focus – 2d Transition Metal Dichalcogenides (2d-TMDs) – in detail, discussing electronic and chemical structure, excitonic behaviour and response to strain. This is followed by a brief overview of quantum information technologies, including concepts such as single-photon sources and quantum networks. The methods chapter addresses quantum optics techniques and 2d-material processing, while the results section shows the development of a method to deterministically create quantum dots (QDs) in the 2d-TMDs, which can trap single-excitons; the fabrication of atomically thin quantum light-emitting diodes to induce all-electrical single-photon emission from the QDs, and lastly, the use of devices to controllably trap single-spins in the QDs –the first step towards their use as optically-addressable matter qubits.
Author: Stephan Hüfner
Publisher: Springer Science & Business Media
ISBN: 3540681302
Category : Science
Languages : en
Pages : 411
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Book Description
Photoemission spectroscopy is one of the most extensively used methods to study the electronic structure of atoms, molecules, and solids and their surfaces. This volume introduces and surveys the field at highest energy and momentum resolutions allowing for a new range of applications, in particular for studies of high temperature superconductors.
